While a coffee mug or even two cupped hands can do the trick in a pinch, there’s a reason we drink liquor out of glasses.

So here’s a really nice glass.

It’s called the Cube Glass, and it’s a vessel with a built-in ice cube that’s not really an ice cube at all. It’s available online now, and sure, we’ll explain more below.

See, LA-based glass guy Nate Cotterman makes attractive handblown items. And in this case, he’s fusing a solid glass cube to the inside of a rocks glass. You put the thing into the freezer, everything stays cold and your drink is never diluted. It’s the old win-win situation that people speak so fondly of.

So, in one sense, it’s like those ubiquitous whiskey stones. But in another, much better sense, it’s not at all.

If a cube’s not your thing, you can also get the glass with a built-in sphere. And if cubes are definitely your thing, you’ll really like the collins glass, which sports two cubes stacked together.

It’s an exciting time for square prisms.